Call island hosting head of production (5)
I believe the answer is:
skype
'call' is the definition.
(to Skype is to videocall on Skype)
'island hosting head of production' is the wordplay.
'island' becomes 'skye' (Scottish island).
'hosting' indicates putting letters inside.
'head of' says to take the initial letters.
The initial letter of 'production' is 'p'.
'skye' enclosing 'p' is 'SKYPE'.
(Other definitions for skype that I've seen before include "Way of calling" , "Computer-based telephone software" , "Telephone over the internet" , "Have a spoken conversation via the internet" , "program" .)